Sure enough, tested it with my server IP and it's working for the test connection.

Fix Test Utility
In: admin/test_stopforumspam.php
Find:
Code
$xmlResult = @file_get_contents("http://www.stopforumspam.com/api?ip=91.186.18.61");

Replace With:
Code
$xmlResult = @file_get_contents("http://www.stopforumspam.com/api?ip=". $_SERVER["SERVER_ADDR"]);

-or-

Code
$xmlResult = @file_get_contents("http://us.stopforumspam.org/api?ip=". $_SERVER["SERVER_ADDR"]);

-or-

Code
$xmlResult = @file_get_contents("http://us.stopforumspam.org:81/api?ip=". $_SERVER["SERVER_ADDR"]);

Changes to Library (if one wanted to use a different hostname or port)

In: user.inc.php
Find:
Code
		$sfsUrl = "http://www.stopforumspam.com/api?";

Replace With:
Code
		$sfsUrl = "http://us.stopforumspam.org/api?";

-or-
Code
		$sfsUrl = "http://us.stopforumspam.org:81/api?";

As stated in the Stop Forum Spam posting you mentioned both of these hosts work:
www.stopforumspam.com
us.stopforumspam.org

On the Ports:
HTTP: 80, 81, 7777
SSL: 443, 4443


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